Answer:
vertical angles are equal:
< (1) = < (2) (in fact they are congruent angles)
so, if measure of < 1 is 63° and measure of < 2 is 4x-9°, than
4x-9=63° ...solve for x
4x=63%2B9°
4x=72°
x=72%2F4°
x=18°
if x=18°, than < 2 is 4x-9=4%2A18-9=72-9=63°...it proves that < (1) = < (2) are congruent angles
Step-by-step explanation:
Hope it helps
For this case we have the following fusions:

We must find 
By definition:

The domain of the function will be given by all the values for which the function is defined, that is, all real numbers except zero.
Answer:
(-∞, 0) U (0,∞)
Answer: A and C because you plug in the numbers -6 for x and -1 for y and check each one.
Hope this helps :)